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Hyundai Equus: Repair procedures - General Information - Engine Mechanical System - Hyundai Equus VI 2009-2021 Service ManualHyundai Equus: Repair procedures

Compression Pressure Inspection
   
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.
Warm up engine to normal operating temperature(80~95°C(176-203°F)).
2.
Disconnect the LH/RH ignition coil connectors (A) and then remove the ignition coils.

3.
Remove the spark plugs.
Using a 16mm plug wrench, remove the 8 spark plugs.
4.
Check cylinder compression pressure.
(1)
Insert a compression gauge into the spark plug hole.
(2)
Fully open the throttle.
(3)
Crank the engine over 7 times to measure compression pressure.
   
Always use a fully charged battery to obtain engine speed of 250 rpm or more.
(4)
Repeat step 1) though 3) for each cylinder.
   
This measurement must be done in as short a time as possible.

Compression pressure :
1,078kPa (11.0kg/cmx, 156psi)
Minimum pressure :
931kPa (9.5kg/cmx, 135psi)
Difference between each cylinder :
98kPa (1.0kg/cmx, 14psi) or less

(5)
If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat step 1) through 3) for cylinders with low compression.
A.
If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
B.
If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
5.
Reinstall the spark plugs.

Tightening torque :
14.7 ~ 24.5 N.m (1.5 ~ 2.5 kgf.m, 10.8 ~ 18.1 lb-ft)

6.
Install the ignition coils and ignition connectors.
    Specifications
    Specifications DescriptionSpecificationsLimitGeneralTypeV-type, DOHCNumber of cylinders8Bore96mm (3.7795in)Stroke87mm (3.4252in)Total displacement5.038 cc (307.3 cu.in)Compression ratio11.5 : 1Fi ...

    Troubleshooting
    Troubleshooting SymptomSuspect areaRemedyEngine misfire with abnormal internal lower engine noises.Worn crankshaft bearings.Loose or damaged engine drive plate.Replace the crankshaft and bearings ...

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